jvx.numeric

Class PnPreconditioner

java.lang.Object

jvx.numeric.PnPreconditioner

Direct Known Subclasses:

PnPreconditionerILU, PnPreconditionerJacobi

public class PnPreconditioner
extends java.lang.Object

Identity Preconditioner used by conjugate gradient and biconjugate gradient solver, all other Preconditioners should inherit from this.

Setting the parameter dim larger than 1, allow to handle more than one equation system with the same matrix in one run. The first equation system uses the 0-th, dim-th, 2*dim-th, 3*dim-th,... entries of b, the second the 1-th, (1+dim)-th, (1+2*dim)-th, ... and so on.

Works on PnSparseMatrix.

Author:

Jonas Hurrelmann

Version:

02.12.05, 1.00 created (jh)

Field Summary

Fields

Modifier and Type	Field and Description
PnSparseMatrix	m_smat

Constructor Summary

Constructors

Constructor and Description
PnPreconditioner()

Method Summary

Modifier and Type	Method and Description
PdVector	apply(PdVector b, PdVector x) Apply the preconditioner to a given vector b storing the result in x This method has to be implemented
PdVector	apply(PdVector b, PdVector x, int dim) Apply the preconditioner to a given vector b storing the result in x using given dimension of vectors This method has to be implemented
PdVector	applyTransposed(PdVector b, PdVector x) Apply the preconditioner transposed to a given vector b storing the result in x using given dimension of vectors This method has to be implemented
PdVector	applyTransposed(PdVector b, PdVector x, int dim) Apply the preconditioner transposed to a given vector b storing the result in x This method has to be implemented
void	setSparseMatrix(PnSparseMatrix pm) Set the matrix to use in the preconditionert.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

m_smat

public PnSparseMatrix m_smat

Constructor Detail

PnPreconditioner

public PnPreconditioner()

Method Detail

setSparseMatrix

public void setSparseMatrix(PnSparseMatrix pm)

Set the matrix to use in the preconditionert. The matrix has to be square.

This method has to be implemented

Parameters:

pm -

apply

public PdVector apply(PdVector b,
                      PdVector x,
                      int dim)

Apply the preconditioner to a given vector b storing the result in x using given dimension of vectors

This method has to be implemented

Parameters:

b -

x -

dim -

Returns:

x

apply

public PdVector apply(PdVector b,
                      PdVector x)

Apply the preconditioner to a given vector b storing the result in x

This method has to be implemented

Parameters:

b -

x -

Returns:

x

applyTransposed

public PdVector applyTransposed(PdVector b,
                                PdVector x)

Apply the preconditioner transposed to a given vector b storing the result in x using given dimension of vectors

This method has to be implemented

Parameters:

b -

x -

Returns:

x

applyTransposed

public PdVector applyTransposed(PdVector b,
                                PdVector x,
                                int dim)

Apply the preconditioner transposed to a given vector b storing the result in x

This method has to be implemented

Parameters:

b -

x -

dim -

Returns:

x